鹬蚌相争，渔翁得利

词语解释
鹬蚌相争,渔翁得利[ yù bàng xiāng zhēng，yú wēng dé lì ]
⒈ 比喻双方争利、互不相让，结果两败俱伤，反而使第三者得利。
英two dogs fight for a bone, and a third runs aways with it; Parties in a quarrel are both losers;